Is Plinius 9200 much better than 8200 MK II?

I have the Sonus Faber Cremonas. The 9200 should drive your Forrest without any problem as far as power goes. Since I haven't heard your speakers I can't comment on the amp/spkr
snyergy. From your previous post I see you like solid state
amps and the Plinius is a very good example of that technology and avoids alot of the traditional weaknesses of some solid state designs. The 9200 in my experience really excells in the bass and drive department with my previous Thiel 2.3's and now with the Cremonas as well.

I owned 8200 mkII and have briefly heard the 9200 (30 minutes?). I'd say the 9200 has definitely the same sonic character overall, and strikes me as a little more honest and clear than my memory of the 8200 mk II. The bass seems tighter, cleaner, and very satisfying. The high end seems a little clearer to me. I do think it's a step up, and noticable, but can't comment on the relative value.

Why not go for used separates?
They will supercede all integrated and will probably cost, not much more. You won't regret it!
SA-102 will do for awhile.